Generate "Custom Element Manifests"

[dylanjha]

There is a convention to create a custom-elements.json file for web components projects. It's a community standard:

• https://github.com/webcomponents/custom-elements-manifest
• https://dev.to/open-wc/introducing-custom-elements-manifest-gkk

The immediate benefits I see:

• Our React wrappers (Build/react wrapper #85) can generate typescript types. This is honestly necessary for React-friendly components. Typescript tooling will be able to auto-complete prop names, surface errors in the developers workflow, and all the nice things like that 😄
• Sidenote (this one is a little more minor): we can make the generator code for our React wrappers a little smarter by using the manifest as the canonical source of truth for the attributes, events, etc. Example here how shoelace does it
• The custom-elements.json file would be a great source of truth for generating documentation. Similar to how docs.mux.com generates API reference docs based on the Open API spec.
• Some web component tooling like this browser extension rely on it ​

Not sure how much of a time suck it would be to do this, but may worth doing a 1 or 2 day spike on it to see how large of a task it is.